Samuel g



(No Model.)

S. G. DERHAM.

FILTER.

No. 478,093. Patented July 5, '1892.

UNITED STATES PATENT OFFICE.

SAMUEL e. DERHAM, or oiNci'NNATL'oiiio, AssieNoE or ONE-HALE To HENRY VEEHAGE, or SAME PLACE.

FILTER.

SPECIFICATION forming part of Letters Patent N0. 478,098, dated July 5, 1892. Application filed November ll, 1891. Serial No. 411,582. (No model.)

To all whom t may concern:

Be it known that I, SAMUEL G. DERHAM, a citizen of the United States, residing at Cincinnati,in the county of Hamilton and State of Ohio, have invented certain new and useful Improvements in Filters, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings, forming part of this specification.

My invention relates to pressure-filters; and it has for its object the improved construction of such filters whereby their efficiency and capacity are increased.

The novelty of my invention will be hereinafter set forth, and specifically pointed out in the claims.

In the accompanying drawings, Figure i is an axial section, in side elevation, of a filter embodying my invention. Fig. 2 is a transverse section of the filter through the dotted line 0c of Fig. l, looking to the right. Fig. 3 is an enlarged transverse section and peispective of the stone sections. Fig. 4 is a perspective View of the cleansing-brush and its connections. Fig. 5 is a sectional detail of one end of the filtering-drum, representing a modified construction.

The same letters of reference are used to indicate identical parts in all the figures.

The body A of the filter is a tight horizontal chamber substantially tubular in crosssection, as seen in Fig. 2, and preferably made of cast-iron, with the heads or ends bolted to fianges on the body, as shown. lVithin the chamber is supported, horizontally, the filtering-drum consisting of a metal cylinder B, supported by circular heads O, secured upon a concentric hollow shaft D, journ aled through the heads of the body A and packed by stuffing-boxes a. Radial pipes E extend from the shaft D to and through the cylinder B.

The filtering medium is composed of blocks or strips in the form of sectors of a cylinder and of the saine length as the cylinder B. These are fitted longitudinally upon the cylinder B, so as to completely surround the same, and they are held in place by T-shaped keys b upon the outer side of the cylinder B, whose flanges enter grooves c in the stone Y sections, as shown in Figs.2 and 3. Theyare further held in place by the inturned flanges CZ upon the heads O, which overlap their outer edges, and the seams between the sections are calked by cement. In this way the filtering medium forms a complete cylindersurrounding the cylinder B and held securelyin place. The under sides of the stone sections are grooved longitudinally from end to end, as seen at e in Fig. 3, and also grooved transversely, as at f, to register with the openings of the pipes E. Perforations g, Fig. l, registering with the grooves f, are' made through the webs of the keys b, thus forming a connected net-work of gutters, forming a waterspace on the inner side of the filtering inediuin and upon the surface of the cylinder B and communicating with the pipes E, as will be readily understood.

G is the inlet-pipe'for the water to be filtered", H, the outlet-pipe for the filtered water; I, a cock for discharging the sediment from the bottoni of the chamber A, and J an airvent. The end of the shaft D opposite the pipe II is closed, and is provided with a crankhandle K or with a pulley for revolving the filtering-drum to cleanse the surface of the filtering medium. To effect this cleansing I provide a brush L, Figs. l, 2, and 4, having a metal back M, with a dovetailed slot upon its upper side to enable it to be slipped upon a bar N, carried by a central screw O, bearing through the top of the chamber A. The end of the bar N, which projects from the brushback, has a perforation, through which passes a guide-pin 7L, cairied upon a lug c', Fig. l, and a coiled spring j surrounds the pin h between the underside of the bar N and the lug. The brush extends longitudinally across the filtering medium for its entire length,and byturning down the screw O it is made to bear as firmly as desired upon the surface of the filtering-cylinder. There is a nipple P upon the head of the cylinder A in line with the brush, through which the brush is inserted and slipped upon the bar N and from which it is withdrawn when worn out to permit the insertion of a new brush. A screw-cap Q covers the nipple P, as shown.

From the foregoing' description it will be understood that the water under pressure en- IOO ters the chamber A through pipe G and entirely lls the former. It then filters through the stones F, forming the filtering-cylinder, is collected in the gutters under the same, and passes off through the pipes E into and through the shaft D and pipe H.

By this method of constructing a filteringdrum of stone sections I am enabled to make it very large and give it very high iltering capacity. For instance, these drums can readily be made six feet or more in diameter, with a proportionate length of nine feet or more, and a constant flow of perfectly-lteredY water of four or more inches can be produced. In addition to carrying off the iltered water the pipes E serve as very effective braces for the drum, thereby increasing its strength, as will be readily understood.

Instead of having the stone sections resting directly upon the cylinder B with gutters on their under side, they may rest at their inner ends upon a iiauge k on the inside of each of the heads C, as in Fig. 5, thereby raising them from contact with the cylinder B and affording an uninterrupted water-space between the stone filtering-cylinder and the cylinder B, and to prevent sagging supporting-backs, as l, might be secured at intervals upon the cylinder B, upon which the stone could rest.

After cleansing the surface of the filteringdrum by revolving it under the brush the cock I is opened to draw off the collected impurities and then closed again when thewater iows clear, as will be readily understood.

Having thus fully described my invention, I claim- 1. In a pressure-filter, the combination of a filtering-chamber, the contained filteringdrum, the filtering medium therefor, composed of longitudinally arranged sectorshaped abutting sections of stone secured together, a water-space behind said filtering medium, supporting-heads for said drum, a hollow shaft journaled through the chamber and extending through the drum, and radial pipes connecting said hollow shaft and waterspace, whereby the ltered water will be collected and drawn off through the radial pipes and hollow shaft, substantially as described.

2. The combination, with the chamber A, of the filtering-drum journaled within the same and composedof theheads C, cylinder B, supported thereby, hollow shaft D, extending therethrough, stone sections F, constituting` the iiltering medium, surrounding the cylinder B, and radial pipes E, connecting the water-space and shaft D, substantially as described.

3. The combination, with the chamber `A and filtering-drum revoluble therein, of the brush L, having the back M arranged to removably engage the bar N, and the bar N, carried by the screw O and held from `turning by the pin h, substantially as described.

SAMUEL G. DERHAM. Witnesses:

J. THoMsoN GRoss, E. H. MOOKBEE. 

